Loontoon, the reviewer (Srajan Ebaen) does not have tinnitus. The person who has tinnitus is a guy named Louis who wrote in a letter to mr. Ebaen, regarding his Butler amp (TDB 2250). Louis was sharing his experience with his Butler amp with the reviewer and how the amp didn't aggrevate his condition.
On the second page of the review, Mr. Ebaen syas this:
" Louis' hereditary tinnitus really piqued my curiosity since it's not something I suffer from but something I know exists as a hyper sensitivity to certain ultrasonic frequencies in particular listeners. I consider his findings with the Butler amp an important bit of unusual information that might be relevant to others who suffer a similar audiophile fate and go through amp after amp in search of the One who doesn't do that irritating thing most other folks -- including the designers -- can neither hear nor vouch for. "
On the second page of the review, Mr. Ebaen syas this:
" Louis' hereditary tinnitus really piqued my curiosity since it's not something I suffer from but something I know exists as a hyper sensitivity to certain ultrasonic frequencies in particular listeners. I consider his findings with the Butler amp an important bit of unusual information that might be relevant to others who suffer a similar audiophile fate and go through amp after amp in search of the One who doesn't do that irritating thing most other folks -- including the designers -- can neither hear nor vouch for. "